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composition-svelte

composition-svelte is a skill for Claude Code from fubits1/svelte-skills. It costs 57 tokens per session (1,800 once invoked), scanned A, original, MIT.

A design workflow for composing Svelte 5 features from wrapper components, content snippets, reactive state, and third-party browser libraries. It helps decide how these parts should be structured before files are written.

In plain words
What is it for?
Use it to design provider or wrapper components, choose snippet APIs and state locations, connect libraries such as MapLibre or D3, and investigate focus or keyboard issues.
Why use it?
It reduces architectural mistakes in components such as menus, modals, maps, tooltips, and panels. It also clarifies where state and content belong.

Skill for Claude Code

Written for Claude Code: user-invocable in frontmatter. Also seen: mentions subagents; names the AskUserQuestion tool.

Part of the svelte-5 plugin — 7 skills shipped together

not rated 10repo 1mo ago A scan 57 tokens original MIT

Good fit Use it to design provider or wrapper components, choose snippet APIs and state locations, connect libraries such as MapLibre or D3, and investigate focus or keyboard issues.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/fubits1/svelte-skills/composition-svelte
View source ↗ fubits1/svelte-skills
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add fubits1/svelte-skills --skill composition-svelte
Clone the repo
git clone --depth 1 https://github.com/fubits1/svelte-skills

Made for: Claude Code.

Or install svelte-5, the plugin that ships this one along with the rest of its 7 skills.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for composition-svelte

README.md
[![agentmods](https://agentmods.dev/badge/skills/fubits1/svelte-skills/composition-svelte/github.svg)](https://agentmods.dev/skills/fubits1/svelte-skills/composition-svelte)
Your own site
<a href="https://agentmods.dev/skills/fubits1/svelte-skills/composition-svelte"><img src="https://agentmods.dev/badge/skills/fubits1/svelte-skills/composition-svelte/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for composition-svelte

Your own site · 80×15
<a href="https://agentmods.dev/skills/fubits1/svelte-skills/composition-svelte"><img src="https://agentmods.dev/badge/skills/fubits1/svelte-skills/composition-svelte.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 57 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,800 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00057 $0.01800
Opus 5 $0.00028 $0.00900
Sonnet 5 $0.00011 $0.00360
Haiku 4.5 $0.00006 $0.00180

Measured 10d ago against content hash 9917e4180aff, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

composition-svelte scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 10d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/svelte-5/skills/composition-svelte/SKILL.md · 105 lines

How it starts

The opening of the file, as written. The whole thing — 105 lines — stays where its author put it; the contents beside it link to each section on GitHub.

composition-svelte

Decompose a Svelte 5 feature by ROLE. Wrong role assignment is the root cause of every architectural fuckup. Before generating files, pin three decisions: composition shape, snippet API, state location. Per-file contracts fall out from those.

Rules from frontend:code-style, svelte-5:code-style-svelte, frontend:editing, svelte:svelte-code-writer, svelte:svelte-core-bestpractices apply throughout. Run mcp__svelte__svelte-autofixer after every .svelte edit.

When to use

  • Designing a wrapper / Provider-style component (popup, menu, drawer, modal, tooltip, panel, slide-in, accordion)
  • Autofixer flagged bind:this
  • About to type $effect(() => { new ThirdPartyThing(...) })
  • About to write prop={appState.x} or prop={someStore.value}
  • Naming a new file Default.svelte / Feature.svelte / Wrapper.svelte
  • Calling setDOMContent / appendChild(svelteRenderedNode) / similar
  • Deciding default vs named snippets
  • Fixing a focus / ESC / keyboard bug in one of several similar menus
  • About to add a maplibre Marker, leaflet L.marker, d3 selection
  • About to type :global(...) inside a wrapper's <style> block

Skip for: CSS-only tweaks, test-only edits, backend / non-Svelte work.

Pin three decisions first

Answer in writing BEFORE generating files. Full tables and pointers in references/decisions.md.

  1. Shape: Composition shape / Non-Svelte Host?
  2. Snippet API: default children, named snippets, or mix?
  3. State location: where each piece of state lives. Options can coexist; pick what fits each piece. .svelte.ts modules (module-level $state exports, classes with $state fields), component-local $state, context (createContext), existing global state.

If intent is ambiguous, ask via AskUserQuestion, never infer silently.

Quick reference

Need Read
Picking shape and snippet/state design references/decisions.md
Composition shape, seven-role contract + folder structure (covers both caller-content and view-dispatcher / Provider behaviour) references/composition-shape.md
Non-Svelte Host shape references/non-svelte-host.md
Lifecycle rune choice references/lifecycle.md
Bridging to a third-party DOM library references/third-party.md
A11y for overlays (focus, ESC, :focus-visible) references/a11y-overlays.md
CSS scope (avoiding :global()) references/css-scope.md
Counter-arguments for common rationalizations references/rationalizations.md

Read the full file on GitHub · 105 lines

Files

What ships with it

8 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 10d ago First seen · 105 lines · 57 tokens per session scan A 9917e4180aff

Subscribe to this mod's changes

composition-svelte is a skill published in the GitHub repository fubits1/svelte-skills (10 stars, last pushed 1mo ago), licensed MIT. It adds 57 tokens to every session and 1,800 once invoked, about $0.0003 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

FrontendVue and Svelte
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